Refrigeration & Air-Conditioning Practice Set-3

May 18, 2021

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1. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

2. Most thermostatic expansion valves are set for a superheat of

3. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

4. Freon group of refrigerants are

5. Which of the following is not a desirable property of a refrigerant?

6. The value of C.O.P in vapour compression cycle is usually

7. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

8. The freezing point of sulphur dioxide is

9. Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

10. A bootstrap air cooling system has


 

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